This is the TJ-FlyingFish: a aerial aquatic drone with a tiltable propulsion system that can fly in the air and perform exploration under water. It rotates its fuselage for lateral movement. It can then return to the surface and take off. It achieves movement by tilting its rotors.
[Credit: Xuchen Liu, Minghao Dou, Dongyue Huang, Songqun Gao, Ruixin Yan, Biao Wang, Jinqiang Cui, Qinyuan Ren, Lihua Dou, Zhi Gao, Jie Chen, and Ben M. Chen from Shanghai Research Institute for Intelligent Autonomous Systems, Tongji University, Shanghai, China; Chinese University of Hong Kong, Hong Kong, China; Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China; Peng Cheng Laboratory, Shenzhen, Guangdong, China; Zhejiang University, Hangzhou, Zhejiang, China; Beijing Institute of Technology, Beijing, China; and Wuhan University, Wuhan, Hubei, China.]